Condenser bushing winding machine



March .W. H. JACOB] CONDENSER BUSHING WINDING MACHINE Filed Feb. 25,1939 2 Sheets-Sheet 1 I NVENTOR I Wf/fiam ff. J cob/f ATTORNEYWITNESSES:

March 17,'1942.- w. H. J ACOBI 2.

CONDENSER BUSHING WINDING MACHINE Filed Feb. 25, 1929- -2 Sheets-Sheet 2a ooooooooooooodboooo 000 000 OOOOOOOOOOOOOOOOQOOOOOO O00OOOOOOOOOOOOOOOO000000000000 OOOOOOOOOOOOOOOOOOOOOOOOOOQO WITNESSES}INVENTOR Patented Mar. 17, 1942 CONDENSER BUSHING WINDING MACHINEWilliam H. Jacobi, Wilkinsburg, Pa., assignor to Westinghouse Electric &Manufacturing Company, East Pittsburgh, 'Pa., a corporation ofPennsylvania Application February 25, 1939, Serial No. 258,558

12 Claims.

My invention relates to a winding machine and more specifically to amachine for winding condenser bushings,

The making of condenser bushings from paper, or other suitable laminatedinsulating materials, entails the requirement that the ultimatestructure shall be uniformly dense throughout, in order to obtain fairand reliable constant working values of the dielectric as well asmechanical strength of the resulting mass. Prior to the actual rollingor forming of the bushing, the materials used must be adequatelyprepared and conditioned to stabilize their structure and equalize orcompensate for inherent variations the laminated materials may possess.

Another requirement is that, in the course of rolling or forming of thebushings, it may be desired to impregnate the paper, or other laminatedmaterial used, with suitable insulating fluids to increase thedielectric strength, or with other elements to impress particularproperties on the bushing.

Still another desirable requirement is to provide means by which aplurality of sheets can properly and simultaneously be wound tofacilitate production and, in certain cases, to make longer bushingsthan the commercial widths of paper sheets or other laminated materialspermit. In preparing the paper for winding, one requirement is that thesheet must be evenly stretched over rolls and move at such speed as toallow time for unfolding and avoid forming any wrinkles or corrugationsto which the paper, or other laminated material, may be susceptible.

The necessary tension which must be impressed in the paper to accomplishthis must be maintained constant and be of such amount as to equalizevariations in the texture of the paper, and, in addition, insureuniformity in the structure of the bushing to be Wound.

An object ofmy invention is to provide a condenser bushing which isuniformly dense throughout.

Another object of my invention is to provide a winding machine whichwill wrap two or more sheets simultaneously about a single spindle toform a condenser bushing which is longer than the-widths provided bystandard paper or other insulating material rolls.

Another object of my invention is to provide a device which willmaintain a constant tension throughout the width of a sheet being woundand which sheet will be evenly stretched over the condenser bushingwithout forming wrinkles or corrugations therein.

Another object of my invention is to provide a device which will apply aforce on the bushing as it is being wound to effect proper wrapping andbonding, which force will vary in accordance with the diameter of thebushing.

Other objects and advantages will become more apparent from a study ofthe following specification when considered in conjunction with theaccompanying drawings, in which:

Figure 1 is a schematic side view of my invention as applied to awinding machine for a condenser bushing;

Fig. 2 is a front view of the arrangement shown in Fig. 1;

Fig. -3 is a view showing the position of the swivel pressure rollers ofFig. 1 when the diam- I eter of the bushing is small;

Fig. 4 is a front view of the adjustable idling rollers shown in Figs. 1and 2;

Fig. 5 is a side view of the tension equalizing idling roller of Figs. 1and 2;

Fig. 6 is a front view of the idling roller shown in Fig. 5; and

Figs. 7 to 12, inclusive, show various modifications of the papertensioning equalizing means.

Referring to Fig. 1, numeral l denotes a supply roll of paper or otherinsulating material, the sheet of which is first led around a portion ofthe periphery of the fiat crowned tension equalizing roller 2 and thenaround an idling roller 3, which is provided with a felt friction shoe 4to iron out possible wrinkles in the paper. From the idling roller 3,the sheet is led around an adjustable idling roller 5, from which it isthen led around the heated, forming roller 1, theme rality of swivelledpressure rollers II, which yoke is urged in a downward direction bymeans of springs l2 which are anchored to a frame I3. The pressurerollers H are biased in a counterclockwise direction by means of aspring 14. The pressure rollers may also be moved in either theclockwise and counter-clockwise direction by means of a handle I5. Thedownward pressure applied through the yoke and its complement of rollersis wholly delivered on a narrow line cbntact along the length of thebushing. The bushing is somewhat soft and not very resilient especiallyas it grows in diameter with the result that indentations and consequentcorrugations of the structure of the bushing are easily produced.

Furthermore, at the line of contact of the incoming paper with the bodyof the bushing, the effective pressure producing the bond between thelayers varies; that is, decreases as the diameter ofthe bushing growsdue to the continually decreasing angle between the center of thespindle and the contact points. To equalize these variations as well asto provide suitable clearances for handling spindles, copper rods, andtubes on bushing 9 grows in diameter to an extent such as shown in Fig.1, the swivelled rollers are swung into position either automatically orby means of the manually operated handle II, thus distributing thepressure along two lines of contact on the bushing thereby easing up onthe pressure, on the bushing at a time when its structure is softer toavoid formation of indentations or corrugations in the very soft bushingstructure. Thus, it will be seen that a uniformly dense condenserbushing is provided.

To further improve uniformity of the condenser bushing, it is necessaryto provide a constant tension which is uniformly distributed along thewidth of the sheet before it contacts forming roller I. Supply roll I'is provided with a brake drum I6 and a pair of brake shoes l1 and I9which are pivoted at point I9. Brake shoes I! and I8 are urged intofrictional engagement with drum It by means of springs 20 and 2I,respectively. Acam element 22 is: pivoted at point 29 on an armextending from the brake shoe II. A yoke and swivelled rollerarrangement 24, similar to that previolmly described, is provided, therebeing a link 25 connecting one ofthe roller arms to the cam 23. In thisinstance, however,

the downward force of the spring is unnecessary since the bondingquality of the supply roll is of no great importance, hence the springsmay be omitted.

It should be noted that the power input to the winding machine isapplied to spindle 8. To provide a constant tension in the sheet as itleaves the supply roll, it is necessary to provide a braking force ondrum I6, which force is proportional to the diameter of the supply rollI. In other words, since the force or tension of the paper is to bemaintained constant and since the moment arm thereof decreases as thediameter of the roll I decreases, thus decreasing the torque applied toroll I by the paper, it will be observed that to counteract such torque,the

braking force which is applied 'to the constant diameter dmm I6 mustcontinually decrease as the diameter of roll I decreases. In order todistribute -the tension evenly throughout the width of the sheet as itleaves the supply roll I, a tension equalizing flat crowned roller 2 isprovided, the structure of which is more clearly shown in Figs. 5 and 6.Roll 2 is provided with alternate grooves or flat portions 28 and 21which extend from a centralpart of the cylindrical roller to each of theends of the cylinder, alternately. Roller 2, of course, is susceptibleto any other configuration which will provide an irregular surfacethereon, the purpose of which is to create a flapping of, the papersheet: that is, a wave-like motion, the purpose of which is to evenlydistribute the tension of the paper along the width of the sheet,asdistinguished from f the ordinary sn both cylindrical idling rollerwhich tends to concentrate the tension along one portion of th sheet.

Referrin ;to Fig. 1, it will be noted that a complemen ary formingroller 26' is provided and which, together with the forming roller I,forms a support for the bushing 9. In cases where it is desired to forma long condenser bushing which is longer than the width commercialsupply mils will permit, it is possible to provide a second supply rollsimilar to supply roll I with its attendant brake structure, the sheetfrom which is led around rollers 2 and 3, and thence on to the other ofthe adjustable idling rollers 6.

Referring to Fig. 2, it will be noted that idling rollers 5 and 6- arelongitudinally adjustable relative to each other for the purpose oflining up the sheets from the two supply rolls in exact butting relationbefore they are entrained about the forming roller 1. A tubular spray2'I' carrying impregnating material is provided to saturate bushing 9 inthe course of winding. The forming roll 'I and, if desired, also theforming roll 26' are heated to soften and cure the shellac or otherimpregnating material with which the paper is treated and which is usedas a bonding medium. If it is desired to wind two layers simultaneouslyonto bushing 9, a second train of rollers, supply rolls, etc., 28, whichis identical with the train of rollers described above, may be provided.The second train of rollers, however, conducts the sheets around idlingrollers 29 and 30 and thence on to the heated forming roller 26. Inorder to start such a bushing, the sheets from rollers 29 and 30arethreaded first followed by the sheets from rollers 5 and 6. The freeends of all the sheets are pulled and made equally taut on the startingof each bushing. A second tubular spray 3| is provided to saturate thebushing with suitable impregnating material, which is fitted with a drippan 32 to catch overflow of impregnating material and thus protect thefresh incoming sheet below. The valves controlling the tubular sprayswhen used are open, as soon as the first turn of paper has engaged thespindle or copper rod.

It will be obvious that the structure just described provides a machinewhich will wrap one or more sheets on to a spindle. In other words, ifit is desired to wrap only one sheet around spindle 8, a single supplyroll I is provided and one of the adjustable rollers 5 or 6 iseliminated, whereas if it is desired to have two sheets wrappedsimultaneously so as to form an elongated condenser bushing, the rollers5 and 6 are both provided and a second supply roller is provided. If itis desired to wrap two layers simultaneously, each of which comprisestwo" sheets wrapped in butting relation, then four supply rolls and fouradjustable rollers 5, 6, 29 and are provided. It is obvious, or course,that a greater number than four sheets may also be provided. in whichevent additional supply rolls and additional idling adjustable rollersmay be provided. In wrapping two layers simultaneously, each of whichlayers comprise two sheets in butting relationship, it is highlydesirable to ship. Fig. 4 schematically shows the disposition of thesupply rolls to show the staggered relationship of the butt joints. Thestaggering of the alternate butted sheet layers on the condenser bushingeliminates the possibility of a leakage path which may be detrimental tothe operation of a condenser bushing.

Figs. 7 to 12, inclusive, show various modifications of the sheetmaterial tensioning means. Therefore, any of the devices hereinafterdescribed may be substituted for the yoke and swivel assembly brake andtension equalizing roller 2. Fig.7 shows a bushing and forming rollassembly 34' and a pair of supply rolls 35', each of which is equippedwith a pneumatically controlled brake 36, the fluid pressure of which iscontrolled by a lever 31 which is connected to the pressure controlvalve (not shown). As the spring-pressed arm 38 moves radially inwardlyof the supply roll: as the diameter thereof becomes smaller, the lever81 moves clockwise and actuates the pressure control valve and relievesthe braking pressure.

Fig. 8 shows another modification of the means for equalizing thetension of the sheet material. Each supply roll 39 has a friction band40 wrapped therearound, which band has one end fastened to a verticallymovable member 4| and the, other end connected to a piston in a chamber42. As the diameter of the supply roll 39 decreases, member 4| is guideddownwardly along a slot 43 thereby maintaining a substantially constantwrapping tension on the supply roll 39. A piston in the piston chamber44 is connected to member ll and constantly urges it downwardly.

Figs. 9, 10, 11 and 12 show another means for providing constant tensionin the sheet material. Fig. 9 is a schematic view of a vacuum box. Fig.is a top view of the vacuum box. Fig. 11 is the front view thereof, andFig. 12 is a sectional view taken along the line XII-XII of Fig. 10.

The vacuum box 45 has an arcuate surface which contains a plurality ofholes 46. Slidable along the surface of the arcuate portion of the boxis one or more arcuate screens 41, the purpose of which is to cover upor close any number of perforations of the vacuum box in order toaccommodate sheet material having widths smaller than that of the vacuumbox. The vacuum in the vacuum box 45 exerts through the holes 46 anattractive pressure on the paper,

thereby efiecting a tension thereon, which tensionis substantiallyuniform throughout the surface of the paper in contact with the box. Aspring actuated brake 48 is applied to the supply roll 49 in order tokeep the supply roll 49 from unraveling. J

The teachings of my invention are not limited to condenser bushingwinding machines alone, but are applicable to any winding machinewhatsoever used for the winding of sheet material, such as, for example,P per winding machines. Furthermore, the sheet material may be of anysuitable composition whatsoever.

I am, of course, aware that others, particularly after having had thebenefit of the teachings of my invention, may devise other forms ofwinding machines embodying my invention, and I, therefore, do not wishto be limited to the specific showings made in the drawings and the\descriptive disclosure hereinbefore made, but

w'ushdo be limited only by the scope of the appended claims.

I claim as my invention:

1. In a machine for uniformly winding a plurality of sheets onto asingle spindle, comprising, in combination, a spindle, supply means forfurnishing two sheets to be wrapped around said spindle to form a singleroll, a means for continuously applyins a force to a small area alongthe length of the outermost sheet layer of said roll as it is beingwound to effect tight wrappin thereof, a means responsive to an increasein the diameter of the roll for distributing said force into a pluralityof smaller components which are applied to a plurality of small arcsalong different lines on said outermost sheet layer.

2. In a machine for uniformly winding a plurality of sheets onto asingle spindle, comprising, in combination, a spindle, supply means forfurnishing two sheets to be wrapped around said spindle to form a singleroll, spring means, a plurality of rollers which are positioned betweensaid spring means and said roll and which are biased with respect tosaid roll in such manner that said spring means exerts pressure throughonly one of said rollers on the outermost layer of aid roll when thediameter-of the rollis small an through a plurality of said rollers whenthe diameter of said roll becomes large.

3. In a machine for uniformly winding a plurality of sheets onto asingle spindle comprising, in combination, a spindle, a plurality ofsupply rolls for furnishing sheet material to be wrapped around saidspindle, roller means between said supply rolls and said spindle along aportion of the periphery of which said sheet material is led from saidsupply rolls to said spindle, said roller means including a rollerhaving an irregular surface to effect flapping or wave-like motion ofsaid sheet material to effect even tension distribution throughout thewidth thereof, said roller means including a plurality of rollers whichare longitudinally adjustable with respect to each other for adjustingthe individual sheets of the supply rolls in butting relation beforethey are finally wrapped around said spindle; and means forautomatically braking said supply rolls in an amount which varies inproportion to the diameter of the supply rolls.

4. In a machine for uniformly winding a plu-' rality of sheets onto asingle spindle comprising, in combination, a spindle, a pair of supplyrolls for furnishing two sheets to be wrapped around said spindle, meansbetween said suppl rolls and said spindle for leading said two sheetsincluding an irregularly shaped roller for effecting flapping orwave-like motion of both sheets, and

a pair of longitudinally adjustable rollers, one for each sheet, foradjusting said two sheets into flapping or wave-like motion of bothsheets, and

a pair of longitudinally adjustable rollers, one for each sheet, foradjusting said two sheets into butting relation before they. are fedaround said spindle, and means for braking said supply rolls inproportion to the diameter of said supply rolls.

6. In a machine for uniformly winding a plurality of sheets onto asingle spindle comprising,

in combination, a spindle, a pair'of supply rolls for furnishing twosheets to be wrapped around said spindle, means between said supplyrolls and;

said spindle for leading said two sheets including an irregularly shapedroller for eflecting flapping or wave-like motion of both sheets, and apair of longitudinally adjustable rollers, one for each sheet, foradiustlng said two sheets into butting relation before they are fedaround said spindle, and means for continuously applying a force on asmall area along the width of the outermost sheets as they are beingwrapped about said spindle to form a roll and means for distributingsaid force over a larger area on a plurality of lines along the width ofsaid outermost sheets, said last named means being responsive to anincrease in the diameter of said last named roll. a

7. In a machine for uniformly winding a plurality of sheets onto asingle spindle comprising, in combination, a spindle, a pair of supplyrolls for furnishing two sheets to be wrapped around said spindle, meansbetween said supply rolls and said spindle for leading said two sheetsincluding an irregularly shaped roller for effecting flapping orwave-like motion of both sheets and a pair of longitudinally adjustablerollers, one for each sheet, for adjusting said two sheets into buttingrelation before they are fed around said spindle, means for braking saidsupply rolls in proportion to the diameter of said supply rolls, andmeans for continuously applying a force on a small area along the widthof the outermost sheets as they are being wrapped about said spindle toform a roll and means for distributing said force over a larger area ona plurality of lines along the width of said outermost sheets, said lastnamed means being responsive to an increase in the diameter of said lastnamed rolls. 8. Ina machine for uniformly winding a plurality of sheetsonto a single spindle comprising, in combination, a pair of formingrollers, a spindle which is supported by and between said formingrollers, a plurality of supply rolls for supplying a plurality of sheetsin butting contact relation to one of said forming rollers and thence tosaid spindle, a second plurality of supply rolls for supplying aplurality of sheets in butting contact relation to the other of saidforming rollers, and thence to said spindle, the sheets from said firstforming roller being wound simultaneously in overlapping relationshipwith the sheets from said second forming roller onto said spindle toform alternate layers thereon, the butt Joints of said alternate layersbeing in staggered relationship. I

9. In a machine for uniformly winding 9. plurality of sheets onto asingle spindle comprising, in combination, a pair of forming rollers, aspindle which is supported by and between said form-.

ing rollers, a plurality of supply rolls'for supplying a plurality ofsheets in butting contact relation to one of said forming rollers andthence to said spindle, a second plurality of supply rolls for supplyinga plurality of sheets in butting contact relation to the other of saidforming rollers, and thence to said spindle, the sheets from said firstforming roller being wound simultaneously in overlapping relationshipwith the sheets from said second forming roller onto said spindle toform alternate layers thereon, the butt joints of said alternate layersbeing in staggered rela- 10. In a machine for uniformly winding aplurality of sheets onto a single spindle comprising,

in combination, a pair of formingrollers, a spindle which is supportedby and between said forming rollers, a plurality of supply rolls forsupplying a plurality of sheets in butting contact relation to one ofsaid forming rollers and thence to said spindle, a second plurality ofsupply rolls for supplying a plurality of sheets in butting contactrelation to the other of said forming rollers, and thence to saidspindle, the sheets from said first forming roller being woundsimultaneously in overlapping relationship with the sheets from saidsecond forming roller onto said spindle to form alternate layersthereon, the butt joints of said alternate layers being -in staggeredrelationship, and means for maintaining substantially constant tensionalong the width of each of said sheets.

11. In a machine for uniformly winding a plurality of sheets onto asingle spindle comprising, in combination, a pair of forming rollers, aspindle which is supported by and between said forming rollers, aplurality of supply rolls for supplying a plurality of sheets in.buttingcontact relation to one of said forming rollers and thence aboutsaid spindle to form a roll and-means for distributing said force over alarger area on a plurality of lines along the width of said outermostsheets, said last named means being responsive to an increase in thediameter of said last named roll.

12. In a machine for uniformly winding a binrality of sheets onto asingle spindle comprising, in combination, a pair of forming rollers, aspine dle which issupported by and between said forming rollers, aplurality of supply rolls for supplying a plurality of sheets in buttingcontact relation to one of said forming rollers and thence to saidspindle, a second plurality of supply rolls for supplying a plurality ofsheets in butting contact relation to the other of said forming rollers,

and thence to said spindle, the sheets from said first forming rollerbeing woundsi-multaneouslyin overlapping relationship with the sheetsfrom said second forming roller onto said spindle to form alternatelayers thereon, the butt joints of said alternate layers being instaggered relationship; a

and means for spraying impregnating material between the sheets as theyare being wound onto said spindle, said forming rollers being heated soas to effect bonding of said impregnating material,

WILLIAM H. JACOBI.

